Process of manufacturing and fitting valve disks



June 15 1926. 1,589,243

' P. L. SCOTT PROCESS OF MANUFACTURING AND FITTING VALVE DISKS Original Filed Sept. 17. 1921 Z/ 1' 6! 3 i f 1%7/672 07 19 99? fzizp HZI. flco it www- Patented June 15, 1926.

UNITED STATES PATENT curios;

PHILIP LANE SCOTT. OF CHICAGO, ILLINOIS, A'SSIGNOR TO SUPER'DIESEIQ TRACTOR GORIfORATION, OF LA'POBTE, INDIANA, A CORPORATION OF NEW YORK.

rnocnss' or murec'runme AND rrrrme VALVE msxs.

Application filed September 17, 1821, Serial No. 501,500. Renewed January 6, 1826.

invention relates to the process of manufacturing and fitting valve disks for injection valves and the like, and applies .particularly to valves ada ted to be used' for the direct injection 0 liquid fuel in internal combustion engines.

In one form of valve ada bed for use in this connection,I have foun it advisable to use a disk adapted to. be distorted by the;

pressure of the fuel against it. In this disk I provide one or more holes of circular or other shapeand I provide also points to fit into and close these holes, except when the pressure of the fuel is such as to alter the 1 shape of the disk and move it away from the point. It is the process of making and fitting these disksand the points which fit into-them that forms the subject matter of this ap lication. a

One orm of my invention is illustrated in the accompanying drawings, wherein-- Figure 1 is a vertical section of one form of my device;

Fig. 2 is a plan view of the valve disk;

Fi 3 is a vertical sectionthrough a modified cm of the device;

Fig. 4 is a plan view thereof;

Fig. 5 is a vertical sectlon through a further modification;

Fi 6 is a plan view thereof.

Li e parts are indicated by like characters in all the figures.

. A is the bod of the injection valve having the central bore A enlargied at its upper 85 end as at A 'A is a threa plug inserted in the enlarged portion A A is'a bore connecting with the central bore A and with the bore B of the screw threaded plu B which. is adapted to be 40 connected wit the fuel supply.

C is a erforated valve disk secured to the end 0 the valve body A by the cap C and spaced slightly away from it by the asket C C 1s a perforation in the disk.

and reduced throughout the greaterpart of 'its length as at D. It carries the enlarged needle pointD adapted to penetrate and to fill the perforation C of the valve disk C. E is anadjusting and supportin member by means of which thevalve rod I h ported in position and adjustable with relation to the valve disk.

the device is that the stiff s ring valve disk disk and the needle valve is a very narrow ed supportingis the valve rod threaded at its upper end is sup-- In the modified form shown in Figs. 3 and 4, F is a. spring disk. It is apertured at F F is a hollow plug contained'within the aperture flanged at F. F is-a packing washer between the flange and the disk to prevent leakage. The needle point pene' l trates the aperture in the plug and closes 00- it.

In the modified form shown in Figs. 5 and 6, G is a sprin disk. It is erforated at G G The va ve member 3 has two needle points G, G, penetrating respectively the apertures G and G Although I have illustrated herewiththree forms of valve by means of which my process may be successfully carried out, it will be obvious that many other forms mi ht function in the same novel manner an I, therefore, do not wish to be limited to the present forms. r "It will be understood, ofcourse, that these valve assemblies are used for spray valves where a very minute quantity of the liquid fuel is sprayed into an engine cylinder at very highpressure, and the characteristic of does not give very far un er pressure and must immediately reseat, as soon as the pressure is released and must so re-seat itself as to plrevent drooling-when the valve is closed.

he zoneof contact between the a one and therefore, a perfect 'fit between the disks and the needle is absolutely essential. 'Thisca'nnot be obtained by machining the parts. They can be made to fit fairly close y machining processes, but the only way to geta satisfacto fit is to actually cause one to shape the ot er and it is this which is done'whenl distort the disk by pressure of the needle valve and hold the parts together until the needle and the disk mateone upon the other to form a pro er seat as a result'of pressure and wear. his wearing process 1s very rapid at first, when the edge of the hole is sharp, but soonis reduced to negli i-. ble amount permitting long 0 eration, as t e 100 worn seat becomes wider. t will be seen that by this method, the seat is just as narrow as the factor of wear in o eration will The process of making and fitting the disks is as follows:

The disk is made from hard spring metal such, for instance, as saw steel and in it a small hole is punched or drilled. This is then placed in position in a valve casing and secured therein by a holding cap. A needle point approximately fitting the hole in the disk is then placed within the central bore of the valve body and in register with the hole in the disk. The valve rod is then depressed and the needle point is forced into the hole in the disk and pressed therein. The shape of the disk is somewhat altered bythis pressure, and the hole in the disk and the needle point engaging together thus tend to conform to each other and, after a short period of operation to mate accurately, so that in the future use of the valve,

7 the needle when positioned within the hole is applied partly to form a seat about the I injection orifice initiating action of the needle and preparatory to completing the process by the needle and the obtaining of an extremely accurate. fit after the valve is assembled.

The use and operation of the form of valve illustrated herewith, is as follows:

In the several forms of my valve, the fuel is supplied to the central bore of the valve bod under high pressure and it is then con ucted to the point of valve opening. In the form shown in Fi ."1, the passage of fuel through the hole in the valve disk is normally completely prevented by the presence in that hole of the needle point. When the pressure of the fuel becomes such as actually to distort and bend the edges of the valve disk away from the needle point, sufficient clearance is provided to allow the passage of the fuel, and it will be injected through this clearance in a finely atomized form.

In a modified form the s ring disk carries an apertured plug in which the seat is formed. The operation of forming the seat by forcing the needle valve against it is exactly the same is if the seat were on the disk itself;

In the further modified form,- where.two apertures are used and a double needle point, the same thing takes place. Each needle point penetrates its own hole and makes its own seat in or about that hole, and in every case, the, pressure exerted by the liquid fuel upon the spring disk has the same operation, that is, tends to deflect the spring and open a minute passage or aperture between the seat and the needle point through which discharge of the liquid may take place.

When this process is carried out and the valve housing with the disk and needle are brought together and put in an engine, their operation at first will not be perfectly satisfactory, but as time goes on conditions of operation will improve as the valve seat is worn by the movement of the disk, and perhaps by the discharge of the liquid, until, after a comparatively short delay the needle valve will have worn or formed a proper seat on the disk. After that has been done the operation of the spring valve will be perfectly satisfactory, because the needle valve and valve disk will have worn or formed or shaped a proper seat for the needle on the valve.

I claim:

1. The process of making and fittin a valve seat in an atomizing valve assenilily which consists in placing in working relation the member forming the valve seat and bounding the atomizing orifice and the member adapted to be seated in said seat and forcing andworking them together to shape and form the valve seat and until they 't exactly.

2. The process of making and fittin a valve seat in an atomizing valve assemily which consists in placing in working relation the member forming the valve seat and bounding the atomizing orifice and the member adapted to be seated in said seat and forcing and working them together to shape and form the valve seat and in the operation of the valve until they fit exactly.

3. The process of making'and fitting a valve seat in an atomizing valve assembly which consists in placing in working relation the member forming the valve seat and bounding the atomizing orifice and the member adapted to be seated in said seat and forcing and working them together to shape and form the valve seat and under normal operating conditions untilthey fit exactly.

4. The process of fitting the parts of an injection valve together which consists in placing the perforated valve disk in place and rigidly supporting it about its eriph-, ery, then insertm a needle valve oosely, into engagement with the perforation in the disk, and then forcing the needle valve against the disk and exerting a suflicient pressure there against to distort the disk and shape the edges of the perforations in strict conformation with the contour of the needle valve.

5. The process of making and fitting a .valve disk to a fuel in ection valve which consists in making a disk, perforating it,

placing it in the valve, positioning a needle point in it register with said-perforation and forcing the two together to shape and form the valve seat and until they fit exactly. 4

6. The process of making and fitting a valve disk to a fuel injection valve which consists in making a disk, perforating it, placing it in the valve, positioning a needle point in it in register with said perforation and forcing the two together, and operating the injection valve until the parts have Worked themselves together to form a satis factory seat.

7. The process of making and fitting a valve diskto a fuel injection valve which consists in mahng a disk, perforating it and partially forming a valve seat about said perforation, placing the disk in the valve, positioning a needle point in it in register with said perforation and forcing the two together to shape and form the valve seat and until they fit exactly.

Signed at Chicago county of Cook and State of Illinois, this 14th day of September, 5

PHILIP LANE SCOTT. 

